Examine source code of Bokeh Valentine

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Bokeh Valentine",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(201, 152, 132, 0.08)",
      "toolbar_field": "rgba(255, 255, 255, 0.05)",
      "toolbar_field_text": "rgb(92, 0, 2)",
      "tab_line": "rgb(187, 0, 4)",
      "popup": "rgb(234, 217, 210)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(187, 0, 4)",
      "bookmark_text": "rgb(0, 0, 0)",
      "frame": "rgb(234, 217, 210)",
      "tab_background_text": "rgb(165, 2, 5)"
    }
  }
}